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 A228761 Primes of the concatenated form 149x149 for some number x. 1
 1496149, 1497149, 1499149, 14915149, 14924149, 14925149, 14928149, 14931149, 14942149, 14945149, 14951149, 14976149, 14985149, 14991149, 149124149, 149127149, 149132149, 149135149, 149150149, 149153149, 149159149, 149162149, 149171149, 149175149, 149187149, 149192149 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequence is infinite. - Charles R Greathouse IV, Sep 03 2013 LINKS K. D. Bajpai, Table of n, a(n) for n = 1..2000 FORMULA Primes of the form parse(cat(149,x,149)). EXAMPLE a(1)= 1496149 is a term in the sequence as it is a prime of the form abcxabc: abc are square digits 1,4 and 9 in order. MAPLE with(StringTools): KD:= proc() local a, b; a:= 149; b:=parse(cat(a, x, a)); if isprime(b) then RETURN(b): fi; end: seq(KD(), x=1..1000); MATHEMATICA With[{c={1, 4, 9}}, Select[Table[FromDigits[Join[c, IntegerDigits[n], c]], {n, 200}], PrimeQ]](* Harvey P. Dale, Jan 14 2015 *) PROG (PARI) for(x=1, 1e3, if(ispseudoprime(t=eval(Str(149, x, 149))), print1(t", "))) \\ Charles R Greathouse IV, Sep 03 2013 CROSSREFS Sequence in context: A128837 A297881 A335289 * A206060 A251973 A236499 Adjacent sequences: A228758 A228759 A228760 * A228762 A228763 A228764 KEYWORD nonn,base,less AUTHOR K. D. Bajpai, Sep 03 2013 STATUS approved

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Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)